Computer-Aided Design Models for Millimeter-Wave Finlines and Suspended-Substrate Microstrip Lines

Pramanick, Protap; Bhartia, P.

doi:10.1109/tmtt.1985.1133235

Cited by 47 publications

(12 citation statements)

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“…An SML is printed on a Rogers RO4003 board, and the substrate thickness is 8 mil. The characteristic impedance of the SML is about 100⍀ [8]. The size of the V slot's open end is about one-half of a free-space wavelength at 17 GHz.…”

Section: Antenna Element and Fdtd Simulation Resultsmentioning

confidence: 99%

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A K‐band suspended microstripline‐fed linear tapered slot antenna and its E‐plane arrays

2004

Micro & Optical Tech Letters

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As stated previously, a lot of potential integrations are possible because the resonant frequency no longer depends on the shape or the material. In Table 1 we have a set of outer dimensions that have been used in other phone-integration cases, showing sets of dimensions that can fit more or less most of the applications. CONCLUSIONWe have proposed and demonstrated a compact antenna structure at GPS frequencies, which provides high isolation and efficiency suitable for mobile devices. The high isolation enables multiple configurations based on the same structure and makes integration more efficient. The antenna also presents extremely high out-ofband rejection. (4, 8, 16, and 32) are fabricated and their antenna gains and patterns are examined experimentally. A K-BAND SUSPENDED MICROSTRIPLINE-FED LINEAR TAPERED SLOT ANTENNA AND ITS E-PLANE ARRAYS

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Section: Antenna Element and Fdtd Simulation Resultsmentioning

confidence: 99%

“…E-plane linear arrays with different numbers of elements (4,8,16, and 32) were studied experimentally. The simulated and measured results show that the element and arrays have a wide operating bandwidth.…”

Section: Resultsmentioning

confidence: 99%

A K‐band suspended microstripline‐fed linear tapered slot antenna and its E‐plane arrays

2004

Micro & Optical Tech Letters

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“…In order to validate the proposed models, the neural results for the effective permittivity of SM and IM lines were compared with the CAD models [5][6][7][8] and experimental results [1,2] proposed by other scientists.…”

Section: Results and Conclusionmentioning

confidence: 99%

“…The first model was proposed by Pramanick and Bhartia (P&B) [5]. This model consists of a relatively simple empirical expression for the effective permittivity in terms of logarithmic functions depending on the geometrical dimension of lines.…”

Section: Current Cad Models For Suspended and Inverted Microstripsmentioning

confidence: 99%

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Simple models based on neural networks for suspended and inverted microstrip lines

Yildiz

Saraçoğlu

2003

Micro & Optical Tech Letters

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where ␦ is the fractional bandwidth given by ␦ ϭ ⌬/ 0 . In the above formula, ⌬ is the filter bandwidth defined with respect to the passband ripple level of attenuation, 0 is the filter center frequency, n is the order of the filter, and g 0 , g 1 , . . . g i , g iϩ1 are the low-pass prototype values corresponding to the designed filter response. k i,iϩ1 , which corresponds to a designed bandpass response, is calculated from Eq. (8). The physical dimensions of the filter are determined with the use of stripline and filter synthesis. A SIRs bandpass filter with a center frequency of 2.4 GHz and a fractional bandwidth of 10.4% was designed based on the previously discussed method. Substrates were made of CBLST dielectric material. Figures 5 and 6 show the computer simulation result using HFSS from Ansoft Co. Ltd. For illustration, measurement of the filter response was also plotted in Figures 5 and 6. In this case, the difference between designed and measured results, such as the measured center frequency's shift up to 2.39 GHz compared to the design's value of 2.4 GHz, is very small. The results of measured and simulated are in good agreement. The difference may be due to the pattern mismatch and the 90°bend between the resonators and input/output ports. By using a cofiring process, improvement of the filter response can be expected.The broadband frequency response of the filter is shown in Figure 7. The response has a stop-band attenuation pole at 1724 MHz. The insert loss is Ϫ48 dB at 3f 0 , thus demonstrating an improvement in stop-band performance when using SIRs. The first frequency of the harmonic passband is shifted up to 9004 MHz, far from that at 3f 0 , which is 7160 MHz.A comparison of [2,3] and the proposed filter's characteristic, given in Table 1, shows that the insertion loss of the proposed filter is very small. This is because four of six faces of the filter are metaled, which reduces the radiation loss. CONCLUSIONThe concept of SIRs was used to develop a compact stripline ceramic filter, using LTCC technology, with a controllable spurious harmonic-resonance frequency. Using a series-coupled SIR, a compact bandpass filter was designed with a center frequency at 2390 MHz and 3-dB bandwidth at 250 MHz. Tapped input/output ports were used to simplify the topology of filter. Simulated and measured results showed good agreement. Simulated insertion loss was Ϫ48 dB at 3f 0 and the frequency of the first harmonic passband center frequency was increased to 9004 MHz. The size of proposed filter is reduced dramatically and insertion loss in the passband is also smaller than ever. The results demonstrate that the proposed filter has good characteristics and its performance will be applicable to wireless communication systems, such as 2400-MHz wireless local area networks. ACKNOWLEDGMENTSThis project was supported by Shanghai leading academic discipline program and the establishment foundation of Ph.D. in Shanghai.

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Transmission Lines and Components

2001

Microstrip Filters for RF/Microwave Applications

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In this chapter, basic concepts and design equations for microstrip lines, coupled microstrip lines, discontinuities, and components useful for design of filters are briefly described. Though comprehensive treatments of these topics can be found in the open literature, they are summarized here for easy reference. MICROSTRIP LINES Microstrip StructureThe general structure of a microstrip is illustrated in Figure 4.1. A conducting strip (microstrip line) with a width W and a thickness t is on the top of a dielectric substrate that has a relative dielectric constant r and a thickness h, and the bottom of the substrate is a ground (conducting) plane. Waves in MicrostripsThe fields in the microstrip extend within two media-air above and dielectric below-so that the structure is inhomogeneous. Due to this inhomogeneous nature, the microstrip does not support a pure TEM wave. This is because that a pure TEM wave has only transverse components, and its propagation velocity depends only on the material properties, namely the permittivity and the permeability . However, with the presence of the two guided-wave media (the dielectric substrate and the air), the waves in a microstrip line will have no vanished longitudinal components of electric and magnetic fields, and their propagation velocities will depend not only on the material properties, but also on the physical dimensions of the microstrip. 77Microstrip Filters for RF/Microwave Applications. Jia-Sheng Hong, M. J. Lancaster

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Computer-Aided Design Models for Millimeter-Wave Finlines and Suspended-Substrate Microstrip Lines

Cited by 47 publications

References 23 publications

A K‐band suspended microstripline‐fed linear tapered slot antenna and its E‐plane arrays

A K‐band suspended microstripline‐fed linear tapered slot antenna and its E‐plane arrays

Simple models based on neural networks for suspended and inverted microstrip lines

Transmission Lines and Components

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